Dungs MPA-4112 Manual - Page 2

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A8: Flame goes out during operation. This could be the result of air in the line, the low fire is

set too low, or the flame rod is producing a poor/intermittent signal (see following Flame Rod

Maintenance section).

A9: Flame failure after ignition and before it was stabilized (within first few seconds) which

produces the Flame ON signal. This could be the result of air in the line during start-up or

the low fire position is too low.

Fb6: Error with POC(Proof of Closure) on valve#2. There is a set screw coming in from the

side that holds it on the spindle which has a groove that the set screw sets in. Do not turn

the switch when the set screw is tightened. If it was loose it could sag a bit and not let it

indicate closed. When the POC switch is closed, closed when the power is off and valves

are closed, the light is red and when open it is green.

Stored Error Codes – The last 10 error codes can be viewed at the MPA display by

pressing the BACK and PLUS Buttons at the same time.

The ENTER Button toggles through the history of error codes, the BACK goes the other

direction.

More info on each error can be obtained by pressing:

+ Button (the state is displayed as long as the button is pressed)

– Button (additional error note is displayed as long as the button is pressed)

Flame Rod Maintenance:

the flame rod can be seen by pressing

and Plus (+) buttons at the same time. After the

flame has been stabilized, as indicated by the Flame

ON indication, you should see a strong signal, in the

50 – 58 range. If less than that, the flame rod needs

to be cleaned.

When the signal strength falls below 50, the flame

rod should be removed and cleaned with something

abrasive (Emory cloth, scotch bite, steel wool, etc.). The signal strength can be impacted if

there is enough carbon buildup or corrosion on the exterior of the flame rod. If the cleaning

process didn't increase the strength reading, a replacement flame rod should be purchased.

If the burner is longer that 3', there may be an additional flame rod to sense the flame on

both ends of the Burner and there is an additional Module (the FLW-41i) to sense the 2

flame rod. The parameters on the MPA are modified to monitor both flame rods.

There is an indicator on the MPA and the FLW-41i to reflect the sensed flame...if it is

flickering, observe the flame to ensure there isn't a turbulence affecting the flame.

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The signal strength from

the ENTER

Heat Injector System

January 2021